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论文类型：期刊论文

发表时间：2008-06-15

发表刊物：MATERIALS LETTERS

收录刊物：SCIE、EI

卷号：62

期号：16

页面范围：2215-2218

ISSN号：0167-577X

关键字：nanomaterials; phase-transfer; monodisperse nanoparticles; powder technology

摘要：In a novel water-cyclohexane two-phase system, the aqueous formaldehyde is transferred to cyclohexane phase via reaction with dodecylamine to form reductive intermediates in cyclohexane; the intermediates are capable of reducing silver or gold ions in aqueous solution to form dodecylamine protected silver and gold nanoparticles in cyclohexane solution at room temperature. The prepared silver and gold nanoparticles are examined by transmission electron microscopy (TEM), UV-Visible spectroscopy (UV-vis), X-photon electron spectroscopy (XPS) and Fourier transfer infrared spectroscopy (FT-IR). It is found that these nanoparticles are monodisperse in size of less than 10 nm and have good stability in cyclohexane due to the adsorbed dodecylamine on nanoparticle surface. Moreover, the synthesis mechanism is revealed via gas chromatography (GC), gas chromatographymass spectroscopy (GC-MS), nuclear magnetic resonance (NMR) analyses of the solutions during the preparation process. (c) 2007 Elsevier B.V All rights reserved.